Re: [PATCH 07/13] sysfs: Update s_iattr on link and unlink.

From: Serge E. Hallyn
Date: Tue Nov 03 2009 - 23:58:30 EST

Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> "Serge E. Hallyn" <serue@xxxxxxxxxx> writes:
> > Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx):
> >> From: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
> >>
> >> Currently sysfs updates the timestamps on the vfs directory
> >> inode when we create or remove a directory entry but doesn't
> >> update the cached copy on the sysfs_dirent, fix that oversight.
> >
> > confused... why not do this in sysfs_addrm_finish()?
> >
> > I guess you'd have to do at it at top before dropping sysfs_mutex
> > so it wouldn't be as pretty as I was thinking, but at least you
> > could just do it once.
> Well sysfs_addrm_finish doesn't really know if you did anything.

Oh right - well it used to through cnt right? but not after your
last patch.

> Beyond that my ultimate goal is to kill sysfs_addrm_start and
> sysfs_addrm_finish. Of course that requires fixing all of the
> sysfs users that depend on the impossible to get right recursive
> directory removal in sysfs, so it is not the subject of this patchset.

I didn't see the patch nixing inode->i_mtime (and cnt) changing from
sysfs_addrm_finish() until after responding. Got it now.

Acked-by: Serge Hallyn <serue@xxxxxxxxxx>

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